Practice Triangulation Method Using Seismic Stations (24.3.1) - Epicentre

Practice: Triangulation Method Using Seismic Stations

Lesson 24.3.1Epicentre

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10 questions

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6 sample questions

Question 1.
What does the triangulation method use to find an epicentre?
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Think about what information is needed to determine a distance.
Question 2.
Which seismic wave arrives first at seismic stations?
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Remember, P is for Primary, which means first!
3Question 3.
What key method is used for locating earthquake epicentres?
- Triangulation
- Geolocation
- Topography
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Consider which method uses three points for location.
4Question 4.
True or False: Triangulation requires at least two seismic stations.
- True
- False
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Think about how many points are necessary for triangulation.
Question 5.
If two seismic stations recorded P-wave and S-wave arrival times of 2s and 6s, and 3s and 9s respectively, discuss how you would apply the triangulation method. What discrepancies would you expect due to distance?
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Consider the role of distance and placement when using waves' arrival times.
Question 6.
Imagine you are a seismologist. Given a seismic station is 50 km away from the epicentre and recorded P-wave arrival time as 5 seconds, calculate the expected S-wave arrival time, given S-waves travel at 60% the speed of P-waves which travel at approximately 8 km/s.
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Use the formula for time = distance / speed and remember the relationship between P-waves and S-waves.

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